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김민태,김두수,오원영 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.1
Silica-based oxide layers were deposited in-situ on turbine blades made from Inconel 713 during the operation of a 13 kgf-class gas turbine, and their effect on the ex-situ oxidation behavior of the blades at 1050 °C was examined. The two turbines were driven by burning liquid petroleum gas (LPG), one turbine at a rotation speed of 35,000 rpm for 4 h (TB04), and the other at 42,000 rpm for 8 h (TB08). For deposition, tetraethylorthosilicate (TEOS) was sprayed into the fuel line immediately ahead of the combustion chamber. The TEOS-to-LPG ratio for TB04 and TB08 was maintained at 5.4 wt.% and 2.3 wt.%, respectively. Directly after operation, the turbine blades were coated with silica layers to a thickness of ~10 μm, independent of the operating conditions. These oxide layers on the blades provided excellent protection against oxidation during both operation and the ex-situ isothermal oxidation test.
헤어리베치 종자의 종피파상과 침지처리가 발아에 미치는 영향
김민태,구자환,김재덕,전원태,성기영,오인석,김충국,박 만,강위금 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04
두과녹비작물 헤어리베치 종자의 종피파상과 침지처리가 발아에 미치는 영향을 알아보고자 국립식량과학원 시험포장에서 2009년도에 생산된 보라 헤어리베치 종자를 종피파상과 침지처리를 하였다. 충분한 수분흡수 를 위하여 증류수 5시간 침지 처리하여 20℃ 유지되는 생장상에서 8일 경과후의 발아율을 조사한 결과 무처 리 종자의 발아율은 56%(경실비율 43%)였으나 침지처리 종자의 발아율은 65%였다. 종피파상처리 종자의 발아율은 97%로 나타나 침지 및 종자파상처리 처리에 의해 발아율 상승효과가 큰 것으로 나타났다.
열분석 방법을 이용한 AISI 5160스프링강의 용접시 Heat Affected Zone에서의 결합규명과 수소취성에 관한 연구
김민태,이재영 대한용접접합학회 1987 대한용접·접합학회지 Vol.5 No.1
To explore the possible application of thermal analysis technique as a probe for finding weld defects, Hydrogen trapping phenomena in Heat Affected Zone (HAZ) of the AISI 5160 spring steel were investigated. HAZ was divided into five parts, which were used as thermal analysis specimens. Two types of trap sites were found in HAZ, ferrite/cementin interface and microvoid. The thermal analysis peak due to the ferrite/cementite interface increased its height toward the weld deposit. The thermal analysis peak due to the microvoid was the highest where the grain size was the smallest. The correspondence between the cold cracking and hydrogen trap nature is also discussed.
석면 슬레이트 지붕 가옥 거주자의 지붕 개량 인식도 조사
김민태,박소영,김미경,함다솜,윤은영,김윤재,장봉기 순천향대학교 기초과학연구소 2019 순천향자연과학연구 논문집 Vol.25 No.1
In addition to the Saemaul Movement, slate roof houses containing asbestos used for the improvement of thatched roofs are exposed to air as the slate is corroded and weathered over time. This study was carried out to obtain the data that help the slate roof demolition support project by grasping the roof improvement awareness of the resident of the slate roof house and residents of the house with layering sheathing on top of an asbestos slated roof. We surveyed 42 residents living on slate roofs in September 2017 and 41 residents of houses living on the slate with steel plates and galvanized iron on top of the asbestos slate roofs in Asan city, Chungnam province. In the 30-59 year residence period, they were more likely to live in houses that were the house with layering sheathing on top of an asbestos slated roof. The rate of respondents who did not know the risk of asbestos was 45.2%, which was higher than that of the house without layering sheathing group, 26.8%. Among the residents of 41 houses that were of the house with layering sheathing group, 87.8% said the reason for the sheathing was 'due to old roofs' and 9.8% said 'because of poor appearance,' while only one person responded to the reason for the low awareness of the risk of asbestos. Among the reasons for sheathing the slate roof, 56.1% said that it was cheaper than other methods, and 22.0% said that they wanted to demolish but the cost was too high. The satisfaction level for sheathing the slate roof instead of demolition was high at 53.7%, with the ratio of "unsatisfied" being very low at 7.3%. As a reason for not sheathing the slate roof, 64.3% said that there was no inconvenience in staying and that it was due to the cost burden. 54.6% of the respondents did not know about the project to support the removal of asbestos slate roofs from the government and 56.6% of the respondents answered that the support project is not helpful because they can not provide the support to all the applicants. As a result, it is costly to remove the slate roof and use new roofing material. Therefore, the slate roof is used as it is, or it is used by sheathing with steel plate or galvanized iron. In order to remove the slate and improve with other roofing material, and expansion of the target and active publicity are needed.